Model
AD8-16 (alternate part number ADA-8) is an economical, multiplexed, eight-bit
Analog-to-Digital Converter (A/D) and Counter-Timer
card for ISA-bus computers. It accepts up to eight
differential or 16 single-ended analog inputs
(jumper configured). AD8-16 requires a full-size
expansion slot. All connections are made through
a standard 50-pin connector. Base I/O address
selection is via dip switch.

Analog
inputs are multiplexed, amplified, held by a sample
and hold amplifier, and then digitized by an eight-bit
A/D converter. Amplifier gain is selected by software
and can differ from channel to channel.

Full scale voltage ranges are ±128 mV, ±5V,
0-255mV, and 0-10V. When operating in the bipolar
ranges, the digital output is available in 2's
complement or offset binary format. The end-of-conversion
signal can be used to interrupt the computer when
configured by jumper. You can select from IRQ
levels 2-7. The interrupt request is automatically
cancelled when the A/D data are read.

There
are two 8-bit Digital-to-Analog converters on
this card. These D/A's output ranges are -10V
to +10V and are intended to drive 10 kilohm or
greater load. Maximum output current is 5 mA.

Model
AD8-16 also accepts up to eight TTL-level or switch
inputs. High inputs may be from 2.5 to 24 VDC
or an "open." All digital inputs are
pulled up to 5 VDC by 1 kilohm resistors on the
card. Low inputs should not exceed 0.8 VDC.

This
card also provides eight discrete digital outputs.
Each output can sink up to 24 mA with zener diode
protection at 5.6 VDC. At system turn-on or reset
the digital outputs are tri-stated and remain
so until the computer writes to them. For interface
to your application program, there are also two
highly useful capabilities: Digital Output Read
which allows a bit-by-bit readback of the current
digital output byte and Command Readback which
provides readback of the Control Register.

Model
AD8-16 also contains an 8254 timer-counter consisting
of three 16-bit counters. These counters may be
loaded and read by software. You have complete
ability to configure gates, clocks, and outputs
either at the I/O connector or via jumpers on
the card. A clock at 1/2, 1/4, 1/8 or 1/16 the
computer clock rate is available for counter operation.
Also, the color oscillator frequency can be used.
Alternatively, an external clock may be applied
via the I/O connector.

Drivers and Downloads

Custom Software

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